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News
CALCULATION OF WEAR RATE
| Author： Date：2011-10-9 9:12:08 |
| A common used equation to compute the wear rate is (Archard,1953).
Vi =ki F s
where F is the normal load, s the sliding distance, Vi the wear volume and ki the specific wear rate coefficient. Index i identifies the surface considered.
The k-value is given in m3/Nm or m2/N, sometimes in mm3/Nm. From design view the wear displacement h is more convenient than V. With hi =Vi /A, the contact pressure p=F/A where A is the area subjected to wear then:
hi =ki p s
The sliding distance s can be replaced by s=v.t where v is the mean value for the slide rate and t the running time.
Because the k-value depends just like the friction coefficient on a lot of parameters this factor is to be find experimentally.
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| k [10-15 m3/Nm] |
class |
Examples |
0.0001
0.001
0.01
0.1
1
10
100
1000 |
- 0.001
- 0.01
- 0.1
- 1
- 10
- 100
- 1000
- 10000 |
0
1
2
3
4
5
6
7 |
class 2/3: with teflon re-enforced bronze - tempered steel, dry.
class 3: hardwearing plastics - tempered steel, moderate load, dry.
class 4: bronze (Pb) - tempered steel, after running in, boundary lubricated fatty oil.
class 7: grinding. |
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